I see many posts about converting the table(s) in a DataSet to a list of DataRows or other row data but I was unable to find anything about this question. This is what I came up with using .Net 3.0:
public static List<DataTable> DataSetToList(DataSet ds)
{
List<DataTable> result = new List<DataTable>();
foreach (DataTable dtbl in ds.Tables)
{
result.Add(dtbl);
}
return result;
}
Is there a better way, excluding an extension method?
Thanks
Based on Why LINQ casting with a Data.DataTableCollection this will work;
List<DataTable> result = new List<DataTable>(ds.Tables.Cast<DataTable>())
IEnumerable<DataTable> sequence = dt.AsEnumerable();
or
List<DataTable> list = dt.AsEnumerable().ToList();
Related
I'm new here!
I have an NSArray like this ("file01_header","file01_body", "file01_xxx", ... ,"file02_header", ...).
I filter it and get 2 distinct NSArrays:
Array_header ("file01_header","file02_header",...)
Array_body
("file01_body", "file02_body", ...)
now I have to subtract from Array_header all the items that have a corresponding one in Array_body, because not all items have a fileNN_body for the fileNN_header in the original array, and I have to give the Array_header as output with only items that has no corresponding body.
How can I do this?
Thanks!!
If you're using swift you can filter pretty easily using a closure and some minor string-fu.
Here's an example:
let funkyArray = ["file01_header","file01_body", "file01_xxx", "file02_header","file03_xxx"]
let headerFilterClosure : (String) -> Bool = {fileName in
if fileName.containsString("header") {
let fileBase = fileName.componentsSeparatedByString("_")[0]
let fileBodyName = "\(fileBase)_body"
if funkyArray.contains(fileBodyName) {
return true
}
}
return false
}
funkyArray.filter(headerFilterClosure)
I think a better long term solution would be to not have such a funky array and use a data structure or at least a tuple with options to manage your file info.
Best,
Josh
I need your help about CouchDB reduce function.
I have some docs like:
{'about':'1', 'foo':'a1','bar':'qwe'}
{'about':'1', 'foo':'a1','bar':'rty'}
{'about':'1', 'foo':'a2','bar':'uio'}
{'about':'1', 'foo':'a1','bar':'iop'}
{'about':'2', 'foo':'b1','bar':'qsd'}
{'about':'2', 'foo':'b1','bar':'fgh'}
{'about':'3', 'foo':'c1','bar':'wxc'}
{'about':'3', 'foo':'c2','bar':'vbn'}
As you can seen they all have the same key, just the values are differents.
My purpse is to use a Map/Reduce and my return expectation would be:
'rows':[ 'keys':'1','value':{'1':{'foo':'a1', 'at':'rty'},
'2':{'foo':'a2', 'at':'uio'},
'3':{'foo':'a1', 'at':'iop'}}
'keys':'1','value':{'foo':'a1', 'bar','rty'}
...
'keys':'3','value':{'foo':'c2', 'bar',vbn'}
]
Here is the result of my Map function:
'rows':[ 'keys':'1','value':{'foo':'a1', 'bar','qwe'}
'keys':'1','value':{'foo':'a1', 'bar','rty'}
...
'keys':'3','value':{'foo':'c2', 'bar',vbn'}
]
But my Reduce function isn't working:
function(keys,values,rereduce){
var res= {};
var lastCheck = values[0];
for(i=0; i<values.length;++i)
{
value = values[i];
if (lastCheck.foo != value.foo)
{
res.append({'change':[i:lastCheck]});
}
lastCheck = value;
}
return res;
}
Is it possible to have what I expect or I need to use an other way ?
You should not do this in the reduce function. As the couchdb wiki explains:-
If you are building a composite return structure in your reduce, or only transforming the values field, rather than summarizing it, you might be misusing this feature.
There are two approaches that you can take instead
Transform the results at your application layer.
Use the list function.
Lists functions are simple. I will try to explain them here:
Lists like views are saved in design documents under the key lists. Like so:
"lists":{
"formatResults" : "function(head,req) {....}"
}
To call the list function you use a url like this
http://localhost:5984/your-database/_design/your-designdoc/_list/your-list-function/your-view-name
Here is an example of list function
function(head, req) {
var row = getRow();
if (!row){
return 'no ingredients'
}
var jsonOb = {};
while(row=getRow()){
//construct the json object here
}
return {"body":jsonOb,"headers":{"Content-Type" : "application/json"}};
}
The getRow function is of interest to us. It contains the result of the view. So we can query it like
row.key for key
row.value for value
All you have to do now is construct the json like you want and then send it.
By the way you can use log
to debug your functions.
I hope this helps a little.
Apparently now you need to use
provides('json', function() { ... });
As in:
Simplify Couchdb JSON response
When I have an array of Sitecore IDs, for example TargetIDs from a MultilistField, how can I query the ContentSearchManager to return all the SearchResultItem objects?
I have tried the following which gives an "Only constant arguments is supported." error.
using (var s = Sitecore.ContentSearch.ContentSearchManager.GetIndex("sitecore_master_index").CreateSearchContext())
{
rpt.DataSource = s.GetQueryable<SearchResultItem>().Where(x => f.TargetIDs.Contains(x.ItemId));
rpt.DataBind();
}
I suppose I could build up the Linq query manually with multiple OR queries. Is there a way I can use Sitecore.ContentSearch.Utilities.LinqHelper to build the query for me?
Assuming I got this technique to work, is it worth using it for only, say, 10 items? I'm just starting my first Sitecore 7 project and I have it in mind that I want to use the index as much as possible.
Finally, does the Page Editor support editing fields somehow with a SearchResultItem as the source?
Update 1
I wrote this function which utilises the predicate builder as dunston suggests. I don't know yet if this is actually worth using (instead of Items).
public static List<T> GetSearchResultItemsByIDs<T>(ID[] ids, bool mustHaveUrl = true)
where T : Sitecore.ContentSearch.SearchTypes.SearchResultItem, new()
{
Assert.IsNotNull(ids, "ids");
if (!ids.Any())
{
return new List<T>();
}
using (var s = Sitecore.ContentSearch.ContentSearchManager.GetIndex("sitecore_master_index").CreateSearchContext())
{
var predicate = PredicateBuilder.True<T>();
predicate = ids.Aggregate(predicate, (current, id) => current.Or(p => p.ItemId == id));
var results = s.GetQueryable<T>().Where(predicate).ToDictionary(x => x.ItemId);
var query = from id in ids
let item = results.ContainsKey(id) ? results[id] : null
where item != null && (!mustHaveUrl || item.Url != null)
select item;
return query.ToList();
}
}
It forces the results to be in the same order as supplied in the IDs array, which in my case is important. (If anybody knows a better way of doing this, would love to know).
It also, by default, ensures that the Item has a URL.
My main code then becomes:
var f = (Sitecore.Data.Fields.MultilistField) rootItem.Fields["Main navigation links"];
rpt.DataSource = ContentSearchHelper.GetSearchResultItemsByIDs<SearchResultItem>(f.TargetIDs);
rpt.DataBind();
I'm still curious how the Page Editor copes with SearchResultItem or POCOs in general (my second question), am going to continue researching that now.
Thanks for reading,
Steve
You need to use the predicate builder to create multiple OR queries, or AND queries.
The code below should work.
using (var s = Sitecore.ContentSearch.ContentSearchManager.GetIndex("sitecore_master_index").CreateSearchContext())
{
var predicate = PredicateBuilder.True<SearchResultItem>();
foreach (var targetId in f.Targetids)
{
var tempTargetId = targetId;
predicate = predicate.Or(x => x.ItemId == tempTargetId)
}
rpt.DataSource = s.GetQueryable<SearchResultItem>().Where(predicate);
rpt.DataBind();
}
Currently, I'm using Conversion Studio to bring in a CSV file and store the contents in an AX table. This part is working. I have a block defined and the fields are correctly mapped.
The CSV file contains several comments columns, such as Comments-1, Comments-2, etc. There are a fixed number of these. The public comments are labeled as Comments-1...5, and the private comments are labeled as Private-Comment-1...5.
The desired result would be to bring the data into the AX table (as is currently working) and either concatenate the comment fields or store them as separate comments into the DocuRef table as internal or external notes.
Would it not require just setting up a new block in the Conversion Studio project that I already have setup? Can you point me to a resource that maybe shows a similar procedure or how to do this?
Thanks in advance!
After chasing the rabbit down the deepest of rabbit holes, I discovered that the easiest way to do this is like so:
Override the onEntityCommit method of your Document Handler (that extends AppDataDocumentHandler), like so:
AppEntityAction onEntityCommit(AppDocumentBlock documentBlock, AppBlock fromBlock, AppEntity toEntity)
{
AppEntityAction ret;
int64 recId; // Should point to the record currently being imported into CMCTRS
;
ret = super(documentBlock, fromBlock, toEntity);
recId = toEntity.getRecord().recId;
// Do whatever you need to do with the recId now
return ret;
}
Here is my method to insert the notes, in case you need that too:
private static boolean insertNote(RefTableId _tableId, int64 _docuRefId, str _note, str _name, boolean _isPublic)
{
DocuRef docuRef;
boolean insertResult = false;
;
if (_docuRefId)
{
try
{
docuRef.clear();
ttsbegin;
docuRef.RefCompanyId = curext();
docuRef.RefTableId = _tableId;
docuRef.RefRecId = _docuRefId;
docuRef.TypeId = 'Note';
docuRef.Name = _name;
docuRef.Notes = _note;
docuRef.Restriction = (_isPublic) ? DocuRestriction::External : DocuRestriction::Internal;
docuRef.insert();
ttscommit;
insertResult = true;
}
catch
{
ttsabort;
error("Could not insert " + ((_isPublic) ? "public" : "private") + " comment:\n\n\t\"" + _note + "\"");
}
}
return insertResult;
}
LINQ to Entity Framework 4.0. SQL Server.
I'm trying to return a list of objects and one of the columns in the database is varchar(255) and contains dates. I'm trying to cast the value to datetime, but I haven't found the solution to that yet.
Example:
List<MyObject> objects = (from c in context.my_table
where c.field_id == 10
select new MyObject()
{
MyDate = c.value // This is varchar, want it to be datetime
}).ToList();
Is this not possible?
Update. This is LINQ to Entity. When trying to convert to DateTime I get:
LINQ to Entities does not recognize the method 'System.DateTime ToDateTime(System.String)' method, and this method cannot be translated into a store expression.
The answer is it's not currently possible with Entity Framework. With LINQ itself it is, just not supported with Entity Framework.
You want DateTime.Parse(c.value) which will take a string containing a date and create a DateTime object out of it.
you can do like this
Date=DateTime.Parse(text)
read, And the best bet would be using your result and then Converting to date time. Like below,
static void Main(string[] args)
{
Console.WriteLine(getme());
Console.ReadLine();
}
private static DateTime getme()
{
List<string> ss = new List<string>();
ss.Add("11/11/2010");
var r = from l in ss
select new { date = Convert.ToDateTime(l) };
return r.FirstOrDefault().date;
}